Mathematics
Medium
Question
Find the fourth proportion to 3, 7 and 9.
A
63
B
31
C
21
✓ Official correct answer
D
27
Community credibility
Registered members can vote for the answer they believe is correct today and explain why. If the facts change after an election or news event, suggest a new option so others can vote it up.
A
63
No member explanations yet for this option.
B
31
No member explanations yet for this option.
C
21
No member explanations yet for this option.
D
27
No member explanations yet for this option.